BLOSUM (BLOcks SUbstitution Matrix) is a widely used scoring matrix for sequence alignments that is based on the probabilities of amino acid substitutions. However, if you are searching for alternative terms to use in your research or writing, several synonyms exist. For example, there are other substitution matrices, such as PAM (Point Accepted Mutation) and JTT (Jones-Taylor-Thornton). Additionally, there are other scoring methods like position-specific scoring matrices (PSSMs) and hidden Markov models (HMMs), which serve similar purposes to BLOSUM. Lastly, the terms substitution matrix, score matrix, and similarity matrix may also be used interchangeably in some contexts.